Refrigeration – Automatic control – By congealed removable product condition
Patent
1991-05-02
1993-04-13
Tapolcai, William E.
Refrigeration
Automatic control
By congealed removable product condition
62342, A23G 912
Patent
active
052018610
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus according to the preamble of claim 1.
In an apparatus of the generic type known from German published patent application 35 44 802 (corresponding to U.S. Pat. No. 4,680,944) a connecting conduit is provided between the storage container and the end region of the cooling or freezing cylinder adjacent the discharge valve, a valve being arranged in the connecting conduit to close off the connecting conduit. It is thus achieved that the ice cream mix can be pumped through the cooling or freezing cylinder, from there to the storage container, and back to the cylinder during pasteurization or also during normal storing operation, when the ice cream mix is kept at a storing temperature slightly above the freezing point. Thus a satisfactory result is achieved from a bacteriological standpoint with comparatively simple means, while, on the other hand, changes in flavor of the ice cream mix are avoided during pasteurization, since a circulation of the total contents of the cooling and freezing cylinder and of the storage container is made possible during pasteurization. The valve to be installed in the connecting conduit is however very expensive and some remaining bacteriological contamination cannot be definitely precluded.
It is accordingly the object of the invention to further develop the apparatus of the generic type such that a bacteriologically safe solution to close off the connecting conduit is created by simple means.
This object is attained in accordance with the invention by the features in the characterizing part of claim 1. The nub of the invention resides in that during normal operation, while servings of ice cream are drawn off, i.e. while the connecting conduit must be closed, the ice cream mix contained in the latter is frozen. A possibility of closing is thus created with the specific means of the apparatus, namely the cooling aggregate anyway available. If the plug of ice cream mix in the connecting conduit is to be melted, then the supply of coolant to the freezing device is switched off.
Further features, advantages and details of the invention will become apparent from the sub-claims and the ensuing description of exemplary embodiments taken in conjunction with the drawing, in which
FIG. 1 is a schematic illustration of an apparatus according to the invention, seen in a vertical longitudinal section;
FIG. 2 is a cross section taken along the line II--II of FIG. 1; and
FIG. 3 is a schematic illustration of a modified embodiment of the apparatus according to the invention, in a vertical longitudinal section.
As shown in FIGS. 1 and 2, a storage container 1 is disposed above a horizontal cooling or freezing cylinder 2--in a conventional fashion--and with it forms a unit. The side walls 3 of the storage container 1 are provided with a cooling tube 4, which extends approximately helically about the side walls 3 and is only schematically illustrated.
The cylinder 2 is surrounded by a cooling jacket 5 through which a coolant can be pumped. The cooling jacket 5 itself is surrounded in turn by a heating jacket 6. The cooling jacket 5 and heating jacket 6 extend substantially over the entire length of the cylinder 2, with the exception of an area located on one end--seen on the left in FIG. 1--in which an inlet chamber 7 of the cylinder 2 is located.
The cylinder 2 is coaxially penetrated by a shaft 8 of a stirring and scraping mechanism 9, which shaft 8 is rotatably supported in end walls 10, 11 of the cylinder 2 and extends out of one end--on the left in FIG. 1. The stirring and scraping mechanism 9 is driven on this end by an electric motor 12.
A disk 13 is attached to the shaft 8, leaving only a very narrow gap 14 with respect to the wall of the cylinder 2. This disk 13 divides the inlet chamber 7 from the actual cooling and/or freezing chamber 15 in the cylinder 2, this chamber 15 being surrounded by the cooling jacket 5 and heating jacket 6. A helical stirring element 16 is secured on the shaft 8 in the chamber 15. Also attached to the shaft 8 are two scraper
REFERENCES:
patent: 4203472 (1980-05-01), Dulaney
patent: 4269212 (1981-05-01), Kaartinen
patent: 4309875 (1982-01-01), Radichio
patent: 4460398 (1984-07-01), Sasaki
patent: 4612959 (1986-09-01), Costello
patent: 4680944 (1987-07-01), Menzel
Lumen GmbH Nahrmittel - und Maschinenfabrik
Tapolcai William E.
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